One problem related to automatic transmission control module has been reported for the 2004 Audi TT. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Audi TT based on all problems reported for the 2004 TT.
Volkswagen of America dba Audi of America initiated a recall on my car, alleging there were "defective welds" in a seam on the clutch. The recall is documented under recall campaign "ja". Audi sent me notice that they were going to replace the clutch. Audi of America sent a notice to their dealers performing the recall work, that there was, "additional corrective action" they wanted performed to the car during the recall. They did not disclose this action to me or obtain my permission to perfom the "additional corrective action". When my car was returned to me, the dealer, apparently under instruction from Audi of America, disabled an electronic feature of the car, electronic launch control, that was operating prior to taking the car in for the recall. Audi of America and the dealer did this without my knowledge or consent. Audi of America refuses to restore the feature to the car, or provide any explanation justifying their action.